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# What is the sum of all the integers from 1 to 80, inclusive?

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Math Expert
Joined: 02 Sep 2009
Posts: 50583
What is the sum of all the integers from 1 to 80, inclusive?  [#permalink]

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30 Aug 2018, 23:03
00:00

Difficulty:

15% (low)

Question Stats:

79% (00:44) correct 21% (01:02) wrong based on 47 sessions

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What is the sum of all the integers from 1 to 80, inclusive?

(A) 3,200
(B) 3,210
(C) 3,230
(D) 3,240
(E) 3,450

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Re: What is the sum of all the integers from 1 to 80, inclusive?  [#permalink]

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30 Aug 2018, 23:13
Sum of the integers from 1-80 is given by n(n+1)/2.

N=80

Sum = 80*81/2 = 40*81 = 3240.

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Concentration: Strategy, General Management
What is the sum of all the integers from 1 to 80, inclusive?  [#permalink]

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30 Aug 2018, 23:45
Bunuel wrote:
What is the sum of all the integers from 1 to 80, inclusive?

(A) 3,200
(B) 3,210
(C) 3,230
(D) 3,240
(E) 3,450

sum of 1st n terms = $$\frac{n(n+1)}{2}$$
$$\frac{80*81}{2}$$ = 3240
D
What is the sum of all the integers from 1 to 80, inclusive? &nbs [#permalink] 30 Aug 2018, 23:45
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